01 - In a medium bowl, combine parsley, cilantro, garlic, red wine vinegar, olive oil, oregano, red pepper flakes, salt, black pepper, and lemon zest. Mix thoroughly until all ingredients are evenly incorporated.
02 - Set aside 1/4 cup of the prepared chimichurri sauce to use as a finishing drizzle when serving.
03 - In a separate bowl, toss the peeled and deveined shrimp with the remaining chimichurri sauce until evenly coated. Let marinate for 10 to 15 minutes at room temperature.
04 - Heat a grill pan or large skillet over medium-high heat until it is hot and lightly smoking.
05 - Thread shrimp onto skewers if grilling, or place them directly in the pan. Cook for 2 to 3 minutes per side until the shrimp turn pink and are just cooked through. Avoid overcooking to maintain tenderness.
06 - Remove shrimp from heat and transfer to a serving platter. Drizzle with the reserved chimichurri sauce and garnish with lemon wedges and additional chopped parsley as desired.